Send struct with double pointer to struct over network

Question

Send struct with double pointer to struct over networkI have to send this huge structure that represents the directory structure over network. It looks like this:

typedef struct{
    char *name;
    int count;
    dir **subdir;
}dir;

I have to send this over network, which means I need to make a deep copy of this in a buffer and send it over TCP. I am pretty new to c and do not know how to make the copy of this whole hierarchy and especially how to reconstruct this on the other end. I am clear on how to handle network part. Please help.

Answer 1

您无法通过网络发送指针，因为它不是真实数据。您需要发送指针指向的实际数据。在发送者的计算机上，您需要一个序列化方法，将整个结构转换为字节数组，并将此字节数组传递给传输框架（或TCP / IP堆栈）。

另一方面（接收者的计算机），您需要一个反序列化方法，将接收到的字节数组转换为原始结构。在您的情况下，我建议您学习json-c，这会有所帮助。通过循环dir中的每个条目并转换为JSON字符串来序列化整个结构。这很容易，因为json-c会为你完成整个事情。